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Consolidated Statements of Income (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Net securities gains (losses) (less than)	$ 1,000,000	$ 1,000,000	$ 1,000,000
Impairment losses related to securities	0	0	0
Net tax effect on income (loss) from discontinued operations	$ 1,000,000	$ 1,000,000	$ (23,000,000)

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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